When generating hints for an evolution, we attempt to construct some

usable Python based on the values provided to the field. We've supported

some basic primitive types, as well as models, but with constraint

support we'll be needing more than that.
This change introduces enhanced type support in hints. It now checks if

it's working with an object containing a deconstruct method, which

Django uses for some types for exactly this purpose. Based on those

values, we can generate a string containing Python code for

re-constructing that object, recursively going into any arguments

passed to it and serializing/reconstructing those.
It also supports directly specifying a class as a parameter, and fixes a

bug with single-item tuples.

Unit tests pass.
Tested this with some upcoming unit tests that make use of these new

type capabilities.